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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f63c81a338cda04c6b8701e485f9ba7b76f7cc32425fb066de91eb908451e5f9' 
  AND token = 'r62wiNOUVAgPTHh/yOd3VDj1f0baEoZ1lZKeXEA5b6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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