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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a9f545d554f886d5284dda3ccded8270e6fbf5d3a1a0cea9693da9291bc9604' 
  AND token = 'uMcYdVaCyJMwRYC7jAxalu7T/t2MopHwqQ6dfY8bMKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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