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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1115b70a948df83f68ad6d48ec8c3a71283e9eba9d6bd2b8ca2fc0ada00a027c' 
  AND token = 'yKY4BEULHvvS6dfrvV9chYYzN4qov9R11Kz6S4Duh60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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