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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '894b9f158a1217a5881f6f3094847ba8ddf8fddc6d56d7cf2b23eeae1e183b1e' 
  AND token = 'S0dCU4c2TeZ7hotR91+ibKmlqsigdLQ8I4cfgIrt2gQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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