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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cb5bc2a4eaf03fd2954adc9acc5f4df5992a09b67d3296333fb74e8965e4909' 
  AND token = 'mBqcZpEZc7yA+Saf8i0nN6mXR6GXi1B3aIYewSOeCrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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