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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41ac655cf46418a798cfca62b3154a3034cd6b98f95180465ccb378c901cb94a' 
  AND token = 'u2skPaQ0peFFBGGN+ewNhKYtHKSc6B/cF4fjt/eBmvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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