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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b0bbd7ad8b72282d13e414c7cd8d70997d410791727f9ac11871dbd7f56994a' 
  AND token = 'TBJkMwEONwO87+GuZXJnvyM681rpStOBQbeK2Ic+Y+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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