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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dead6a1d051c057c4c3376e89e6cae59cf0a14889390bf7d2bfd9799f2e5ad1b' 
  AND token = '0gC2myXUTmSJblkrbA7NkG2NA9vFXOGHtzIrUf4l2Fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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