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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be186825d02042e3491d116bfd7d2184f64670d179a529a3e081b978e76ea313' 
  AND token = 'tbKYH+a50w56Eo6F3SJtf2Qyk6cUy1f/NnfHBsKy5Mc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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