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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fda763ceb7e69c66cc654ec6f51e55a4315a56af0723dba9169e4b0e8e8e388' 
  AND token = 'Y+FssJaiNn56um2WExWbRnlni93/tcP7hkd0hUG9lsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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