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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '093327543973b93c948c88543f46871f2c2ba04646e8115955f4adf06aafbf75' 
  AND token = 'sW6FQ8fAviUkMHhnt2IAlo46ktrGb22Ob3/D1rgplNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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