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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56b02b93844903fb3b8d2e49f1ac1400a451ca6b1c79719035987b69137013fd' 
  AND token = 'fF2AOp/gBrhApHh7CvOkkWLcFTHF2U+y+AeqLipaKU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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