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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3bafc07a72f5283b036afebf32952a55f0165787d61a95d7bef6c1b886d0c82' 
  AND token = '2Z5HH5kf3bJbzxOy7EC4NLnn72ZvrIuQbe2Zr43iFEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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