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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89ae25cbc3a1e2ca557ae632f166eab4b3192cd319196327ee4c15b946b378ff' 
  AND token = 'hN1J8+6UKwVAfyVqY5Zel18xthwcOuwulUFd4o4JkWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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