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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86f3fe8d2a7ec2c7c410d4e30838743342d050736e9306d41db412fb84f8918b' 
  AND token = 'Gjvz3FJ3GtB6GqXI5fI1mvfcr+LdlbwGJKIx0f34AvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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