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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb6b62ddc48593c5769c980a2a799c0e8ca3a92961a80e70870e5cdb2f3f5073' 
  AND token = 'oD7oVVjeZnRF1v0Gziu+zUPpvTIZFpdRQUEBtHJLZek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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