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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd325c73bbcfe44b09d5f2efa8df2a0551674641716c6434c2410fe5d0b6f5e5c' 
  AND token = 'tSARdyAYCslbGbYXSzny+sMaWKgRZKx+nCP4TWDhI/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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