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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b22ba9fe858ff698da25c45018277b8ad84524cc6ccd7d3018bd3b057d617aa6' 
  AND token = 'IGyd5uWNU8ZS5Lm9d2aKa0XgEhiIOM2rVE7kcljX04I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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