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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd38c332c22e7663f7761b1607220e21a2d181dda9ce30139458a9d59db6ae0b' 
  AND token = 'e+8PFQOPTj93Imi4wFa56VtN3ctqEMPGhdNOmfMDLJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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