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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '183e988cc12189c2b385078d667882b7a0fd91b05afc427c5b13c94f4b0b4d52' 
  AND token = 'glqDLrAS66S7i+Cevm35s7LTn8kvBomVLAyhftGDvXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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