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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76eceb66cb90b59a0c2e7b832756791db6a90fe8ef976b2f9295d8c79571d6ee' 
  AND token = 'FhhmGn6d44S+kETeOobsUJETTBCMFW1F9nl2+flcfAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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