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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cde0b02b2a0345b5248e508af2976d85ad7ceda63591d25d50d9f86d830ee3c' 
  AND token = 'RQegFzTjwyso0aRB3RVbhpMm2Xh+3VO2WOnvlBgl7rY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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