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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '113e49ccef0e376a9f4e41f2aa4d4901abaa621d1487a2191cbdf3817e828a5a' 
  AND token = '6/mPY/aBjo8aij61EbEMd7kFo+ETiVV/4SER1+QtsnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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