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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b5202aa7640842b84d88fb23e6ab9925fe5769a1b132f0ef23ef513177d6a02' 
  AND token = 'O2iUXMaPFhua1mn9eQ7SRX1F7RNAfQy9HkshkQ1d/1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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