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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cf9a2fdc457b53b5b8efaca8b16b70bc7f2aca04960f2c6df6954a66d1a88f9' 
  AND token = '7cqpNR0Oq4LVL3m91zs9l2SBq+d5uM60ZI3RNYnekSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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