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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0df0dda829644e35003239179e1e09c0b79671cd403184cc11392d55eea583ff' 
  AND token = 'fgsj9HJoYVlhdIUq9R1Q4TL2OPy4hmbIWBrb6ZSRH0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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