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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e97e766efa1443a7e70eca9e25ed971581693021072867565e436ecaf6946353' 
  AND token = 'zjPMKeTqUtf0KJh3jbHH/g3laZAOc6lqxl52Qav2Jf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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