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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77c4dcc6cd2b173e55f964aeb9c4f79c53e630ffbdf101891228d07bf63cd14a' 
  AND token = 'VJhBln1r6PY1yEabCI/32TRz3ht/5wX1byE9UFh3GTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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