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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5e370f4283d3d1201e15bdf7911a37b319dd4a2d17fdf4c814e0bdfcd8eb2f2' 
  AND token = 'my+R6VYVBmA4V/Ei9rNM2vINb1Arm+sr+wRz0kSQvnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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