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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b644f7b4ee90d35459f7819f62ccd55c6839e2fa0dcafc6f3809c8ca3fea29f8' 
  AND token = 'hBvtcx2Ws+sd33lQ8otPF+bQaf4RW0RwnwefziuKGic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00222

JSON explain

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