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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd9acff1b06af2f377912647cd4d8cfb4a27c8c1f2b16b672d877e2173ceac27' 
  AND token = 'fE6kmbkt0zH4uGIJUfvGozIQTh9eDgCIa5siuSPMQho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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