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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c5c849a5cdf9840e1662d581c3552cbccaf55f336f5555ea05fa20603c0b2b4' 
  AND token = 'zYys/JRB1eno2GDeYsS/oi2tPhP3kMBjCOQmJdUJIHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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