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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73a60d1d07b1a5b950016ec82d0e5e14619312e37cceb3eb089f8de7a8aa4cb7' 
  AND token = 'RJ1Q9lQXh6QqLj6X1AjvlMTRZZ1FW2Jvh+ZGy/sWGi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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