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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b592064cb90010b27034fb5b8f05f3fc0da89601f2cd5f5e280f4b2beec66bb3' 
  AND token = 'rbpWWVRcJAxyO3Nson+kbSmG+WRN85PL5ALsSau3BUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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