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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b09b433be0b1f6e9fd4fd224db09ad4b10d5539958944e390bfaa27d5590aba7' 
  AND token = 'quR0s+gn8dCyEXWu4JC5t1Lat4ZSd58jL0lbbSWBju0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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