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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '678607cfba8205746de0ac263040f50f97ccee19c1d5d24b3d1d9e5b983e16be' 
  AND token = 'ueeX88V9dDhRk3jmTYVykk64wUaFeZoo4B7o5tR0ZGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}