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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b475f0df12235fb6d1aa3527c767d1662bbaf235f0b8baae3ca6866b3baff0e' 
  AND token = 'Y79AtEzzvpiwaUM0UEhpDThqev8KZmrFbFzfdyMFCYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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