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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e69146969e3a6957fab6cde7cfd48ec00f9963ab47ad704c542f8bf4e014c21' 
  AND token = '8+9YQ9H2uqmMLptgXIo4DOfzLdlnWJ3h2b2tUZlHNI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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