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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb2e8b4895cf8697705464679e90ac4611cb946d7510d71662f9695eae23dbf5' 
  AND token = 'PVzmGnLZA8vXzi4mkL43nc/p/ueeYgcHzx6mrdZtWyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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