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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0593481b00aa7fdc803e77a830125c239ed21bd8fa8f335889fe1685030c6e0d' 
  AND token = 'sG9LQCmFojmaXgL0G3Icp3+l+W4oi2QQVJ6gxqOr4t0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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