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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ba36e0e9907b96edb42f97817f8720e2edb4775c59308560506e031357f125c' 
  AND token = '0qKdR1Hjsbrws9fLljPOlsDhqhqdhIm4iip8kVoZWR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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