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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb440b482cac489d3e1ebcfef1e2d5ccca4d5db7aead2ddcca3a45608555f3d9' 
  AND token = 'YpuYzMLQ4IV7c2oQcgYGmswF5QSwd36nSZfU+lKxzXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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