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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75eb11c785aa8d3e3695cbb9f5261a0f2769609006b562a62dc5b11b20fc974d' 
  AND token = 'b1i+wpBU4lUHBmRsg83gr01k5RT7OVIlhDwOsVF9zBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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