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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32212da10143d579ad256f907a0ebf7fe061994ad40a3d69e9bad31c8ffde320' 
  AND token = 'C1X79gucLNK8gmUEaKna1/uLm4w8DNTFV/+KXVARysY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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