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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb1bbe0ed603f7e042d81d9e2e08b96ae2277f366123df23dbdd58764784d177' 
  AND token = 'sICYwnDyLR+V7eNcjkgU++jKjHsM0XzZFqufjrTYDx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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