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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a2b1a1d638ce9936dfbeec5e74796157db3e57548dbcf69f9976d9e67b99384' 
  AND token = '+LALr914Ot9kLX3BqtyCQEgnTu49mXAM6mUxFRMdoP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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