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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1789a9f03c4657784059f4ca0805faab616774fd8e65e6fe939d35996386a68b' 
  AND token = 'x/GLOwHe8x4aTeFdjyrwkEO/+I9Zpq/b4o4EL2LSCJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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