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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a53c98ab03e2866d0704df8eb08a5fd0e2f98e936c3d54720676ed8a06ad1efb' 
  AND token = 't6LD0U1BEAYYEtKZUrPzN3lPMzobu6t90KKb7Nq1qvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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